Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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Fish Community Characteristics in the Gyeongan Stream, a Tributary of the Han River Drainage System, Korea

한강지류 경안천의 어류군집 특성

  • Received : 2020.02.24
  • Accepted : 2020.03.26
  • Published : 2020.04.30
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Abstract

This study surveyed Gyeongan Stream, a tributary of the Han River Drainage System, from April to October 2017 to investigate the characteristics of fish communities. The survey collected 40 species of 11 families from 48 survey stations using kick nets and cast nets. The dominant and subdominant species were Zacco platypus (48.0%) and Rhynchocypris oxycephalus (17.7%), respectively. The next most abundant species were Pungtungia herzi (6.8%), Z. koreanus (5.0%), Carassius auratus (4.3%), Squalidus gracilis majimae (2.7%), and Rhodeus notatus (2.5%). Among the fish collected, 14 species (35.0%) were Korean endemic species, and the exotic species were Micropterus salmoides, Lepomis macrochirus, and Cyprinus carpio (Israeli type). The land-locked species were Plecoglossus altivelis, Rhinogobius brunneus, and Cottus koreanus, while the species sensitive to climate change was C. koreanus. The community analysis showed that the dominance was higher at the uppermost stream station, whereas diversity and abundance tended to be lower at the upstream station and higher toward the downstream station. The community structure was largely divided into rivers (uppermost stream, upstream, and middle-lower stream) and lake. The river health was mostly good (23 stations, 47.9%) and fair (15 stations, 31.3%). Comparison with past surveys showed that 12 species identified in the past surveys did not appear in this survey; nine species appeared for the first time in this survey; and the ecosystem disturbance species - M. salmoides and L. macrochirus - tended to spread more widely gradually.

한강지류 경안천의 어류 군집 특성을 밝히기 위해 2017년 4월부터 10월까지 조사를 실시하였다. 조사기간 동안 48개 지점에서 족대와 투망으로 채집된 어류는 11과 40종이었다. 우점종은 피라미(Zacco platypus, 48.0%), 아우점종은 버들치(Rhynchocypris oxycephalus, 17.7%), 그 다음으로 돌고기(Pungtungia herzi, 6.8%), 참갈겨니(Zacco koreanus, 5.0%), 붕어(Carassius auratus, 4.3%), 긴몰개(Squalidus gracilis majimae, 2.7%), 떡납줄갱이(Rhodeus notatus, 2.5%) 등의 순으로 우세하게 출현하였다. 출현종 중 한국고유종은 14종(35.0%)이었고, 외래종은 배스(Micropterus salmoides), 블루길(Lepomis macrochirus), 이스라엘잉어(Cyprinus carpio Islaeli type) 3종, 육봉형 어류는 은어(Plecoglossus altivelis), 밀어(Rhinogobius brunneus), 둑중개(Cottus koreanus) 3종, 기후변화 민감종으로 둑중개 1종이 채집되었다. 군집분석 결과 우점도는 최상류 지점들에서 높았고, 다양도와 풍부도는 상류지점이 낮고 하류 지점으로 갈수록 높아지는 경향을 보였다. 군집구조는 크게 하천(최상류, 상류, 중·하류)과 호수로 구분되었다. 하천건강성은 좋음(23지점, 47.9%), 보통(15지점, 31.3%)의 비율이 높았다. 과거조사와 비교한 결과, 선행조사에서 출현하였으나 본 조사에서 출현하지 않은 종은 12종, 본 조사에서 처음으로 출현한 종은 9종이었으며, 생태계 교란종으로 지정된 배스와 블루길은 점차 확산되는 경향을 보였다.

Keywords

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